Hey Ernest,
Sound like you may have accidentally moved your 3D cursor off center. In order to reset your 3D cursor back to the 3D viewport’s origin, press Shift+S with your cursor in the 3D viewport and select “Cursor to Center”.
Of course, no matter where the 3D cursor is, you should still be able to move the cone around in 3D space by dragging the transform manipulators and rotating the 3D camera around.
Let me know if this helps ya! 🙂